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If you have an inch to spare in front of your chevy small block you can now have 10 litres


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#1 mariner

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Posted 09 January 2017 - 16:01

The combination of falling CAD costs and CNC is allowing the fabrication of custom engines in small quantities.

 

This angine is only 0.475 longer than a classic Chevy SB and can go to nearly 10 litres

 

http://www.enginelab...l-block-engine/



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#2 Fat Boy

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Posted 09 January 2017 - 20:13

At what point do the cylinders just get too damned big for reasonable combustion? If you're over a liter/hole it seems like you must be getting close. I know diesels get massive, but at what point are you better off adding cylinders in a gas engine?


Edited by Fat Boy, 09 January 2017 - 20:14.


#3 Charlieman

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Posted 09 January 2017 - 22:06

An IC engine comprises a combustion chamber and swept volume. When considering heat transfer, you have volume (swept volume, combustion space volume) and area (dome, cylinder, piston area). For a conventional four stroke engine using conventional engine size parameters, 300cc to 400cc per cylinder works very well.

 

Once you build a bigger engine, the volume to area factors change. You just build a different engine. 



#4 Kelpiecross

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Posted 10 January 2017 - 04:11


That's not a big engine - this is a big engine:
https://www.sonnysracingengines.com/

One of these V8s is nearly 16 litres or 2 litres per cylinder.
And a RR Griffon is more than 3l per cylinder.

#5 Wuzak

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Posted 10 January 2017 - 04:34

That's not a big engine - this is a big engine:
https://www.sonnysracingengines.com/

One of these V8s is nearly 16 litres or 2 litres per cylinder.
And a RR Griffon is more than 3l per cylinder.

 

A Daimler Benz DB 603 was 3.7l per cylinder.



#6 Greg Locock

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Posted 10 January 2017 - 06:43

For normally aspirated carburetted spark ignition engines the optimum for torque/swept volume was often claimed to be that 300-400 number. Much bigger than that and you start having to run super long strokes to avoid choking the valves (this was in the time of 2 valve heads), which of course would limit the max power.

 

I can't really see that forced induction makes big difference, or even fuel injection, to that argument. However in the case of a big diesel they could live with a longer stroke.



#7 Lee Nicolle

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Posted 12 January 2017 - 22:26

My take on those very big capacity small blocks made by World Products and others is that they really are a waste. 454ci small block Chevs and 460 small block Fords are just so jammed up with internal components.

I have built a couple of 347 Ford Windsors and you are grinding the pan rails for rod clearance [and denting the pan also] and the room between cam and rods too is very tight. Even 331ci requires some clearancing.

The factory 400 Chev too is very tight, shorter rods and external weights on the balancer and flywheel. The 4 1/6 block with a shorter crank is accepted as a better platform for performance. Though the siamesed bore can be a problem.

400M Ford is 4x4" and is a big grunter never to be turned hard but does pull a full size 2 tonne tank around quite well.

10 cylinders may be a better deal than long stroke tank engines though probably as heavy and no more powerfull as a 454 [and derivations]  with alloy heads intake etc.

The Sonny Leonard engine is also a deal longer for bigger bores. really a drag engine only.